Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2012	Nov. 30, 2011
Cash flows from operating activities
Net income	$ 6,133	$ 5,499
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,595	10,466
Stock-based compensation expense	1,043	1,122
Other	169	3
Decrease in operating assets:
Restricted cash	2,091	2,269
Accounts receivable and other assets	3,857	3,060
Increase (decrease) in operating liabilities:
Accounts payable	695	(1,394)
Accrued and other liabilities	(4,424)	(7,897)
Income taxes	(5,397)	3,294
Total adjustments	8,629	10,923
Net cash provided by operating activities	14,762	16,422
Cash flows from investing activities
Purchases of property and equipment	(5,892)	(3,710)
Proceeds from sale of assets	2,115	122
Other	513	(729)
Net cash used in investing activities	(3,264)	(4,317)
Cash flows from financing activities
Payments on debt	(3,759)	(3,758)
Purchases of treasury stock	(16,882)	(9,852)
Other	(774)	(926)
Net cash used in financing activities	(21,415)	(14,536)
Net decrease in cash and cash equivalents	(9,917)	(2,431)
Cash and cash equivalents at beginning of period	52,647	29,509
Cash and cash equivalents at end of period	42,730	27,078
Non-cash financing activities
Change in obligation to acquire treasury stock	$ 1,194	$ 599